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The two root traits in different cropping combinations on the 6th (A and D), 12th (B and E), and 18th (C and F) d after germination under two P levels in gel. HX3/NE1: HX3 intercropped with NE1; HX3/GZ1: HX3 intercropped with GZ1; HX3/HX3: HX3 self culture; NE1/NE1: NE1 self culture; GZ1/GZ1: GZ1 self culture. Parameters with the same letter on the same day showed no significant difference (Duncan multiple comparison, P < 0.05).
